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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cb6620036bb471e75bd9bc883204ca2491017216225d976dec2650156e90bd' 
  AND token = '5bBvyah4xcEL1dI/sjt5C+Gm6m8wxRe+FDQb9I8YY+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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