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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c9518efad39267a55a6835614b0852e0e5e642c0646e5e4053f53a95e6e49d' 
  AND token = '1PrXxNyEELEIFYhDztKoWEyNKYh5FSsg8yHjDLennUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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