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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53069221902327209e8ac049919a47fcd154eb2a3560ecb6416886eda188f7be' 
  AND token = 'OjY8bPcrrfjd5ZFvueNoX26vyzJ7CheG1es/dJvNu2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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