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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53c71e129a6885f7fba6e3fbd618bb1612ca8e5f42e88b1579588100e742cd7' 
  AND token = 'tw5gs29mU6FzopdVnsUAEr/4WAprYNSns6QocLlD784=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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