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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854e32e81709f264864941f8cc00c0a9b4889ac028d6db73ede4701d537a8701' 
  AND token = '0tMMS+407/2AsiBmDKYAq/Qxrb8L90GKjyx4kGzp0CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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