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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e00a6ee033ad159f53f124aa04ed0fb70ae94eee0eaeea47b594619a52c9e0' 
  AND token = 'y0qVojHFJRupvLQfSuOjlOHw6MJfAwLG2+f3H6pmdvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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