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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908de45c78b5c0da41681e2b968f3deb72b39081b604e139b5ea880e766f27b0' 
  AND token = 'iuw3Smb3cZ8FeEhRe1AfVi2R+cKvXvssggYrr92EDYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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