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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef23433dcea1c2832f23e8443a3a5709c9b86372a0829f6b5ec24ed18facadab' 
  AND token = 'MJrYnqIKmWMv1il11/YITca8bnknmW9I66P3ukwbzt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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