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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566076dc859174a10d96e71de0965467853644de4050b9a702ea920578d73b0e' 
  AND token = 't6ZbM6lvCD16Olro4wOJGhFvgFfua7aw1B28iyfAKEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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