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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efad18b33f7504e9206c1740ea1ba1239db55aecf121e00ac1670c3318b71613' 
  AND token = 'CqRkkEZWyTresAIWz1A5SJg4fqFYvWu28TEeOUmWkr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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