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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ec57b13c112834a8d9a9f5cdee31df2ed30244ec48d001c9753e7da294f1cb' 
  AND token = 'U3TWI+3nTiOdSGQJPrAwqCEBTwry3r9K0x6AAvUdWIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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