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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4fe8b37114650d251b4d65561a3fac9a25201224760136d796e89341c73b48' 
  AND token = 'fQn52M6LNTQsfjcWARBihfNUdSrymPSnN8RwduMgec4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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