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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda6f0dd334cd0368b7d0b9cc8e03bc529fbc76854e4f56acd85ab04fcb5fd8c' 
  AND token = 'aUPU9Vx3qSDewSI1VFKJQMS0GHgzzdq940ocV4Y0zaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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