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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936b09bed60b897a1875ad0fb2c07f96c1f0e01025ccc525df8f0ea995163a81' 
  AND token = 'vhCqYh2zAwejzgcueoYgYl98aWoO8PYeJKAQcH7PWWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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