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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5304d4fbee352f34c1dac8bf96e9dd7d7fb019b1f9bb6fb0475277a0f27cb31' 
  AND token = 'lvLTO2C1JBdM7ESyqVAdO1yINUp0Q7q3jyyIM67BVDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}