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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6878c1fccc75dad4967c1989667741e737f635e71400ef88fff409700f9cef' 
  AND token = 'qBV0HtFQih4cp7WmnB+46t3UitGH1HiK0NDol+u2tzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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