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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1af9af0c42ba87255cf1078de1ddeac849f4f9b56bbaae75abf713dd3ad94e' 
  AND token = 'D/m/tdnfZLwp3eLmO3oxmqHxRIavHVbGXS/q20L2Mpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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