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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504a95e5749f6623369e8042e4774e66729777a1964cf21ef9791da3d0dae868' 
  AND token = 'KMphZ2Sh0X22obvuNFtR6xFT/hTfxdqBuW2w4VpnSe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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