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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aad61a2f5cfd861f8aaa222a7d47ef069999a80688c1fc6123d6f5a506b1107' 
  AND token = 'YMXXH8HEJsiUoQoyQZUpPLUUqwtyuLM5KBv6GX9kWog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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