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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d4ee73b9c1ff2c03c0adb291e29d42912d8b07d5a2b4eb2f8bf35ad6f9e65b' 
  AND token = '79En8jg0Xq5W6iwV8HsfTZVMzuqbIWAZA/dGHM2aNPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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