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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88ce40c6139827a56fd5c1473ff33ba576147e5d51142347fba98c45aed5127' 
  AND token = 'u/gc2fI3YcCVtai9Q59fNUUqUwLoRJ3g0lYrinyTtPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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