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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9551e4faf8c775d5bc6fe317e69b6fe04235fc23a9aa82f4b24cad1fbc6ab37' 
  AND token = 'nGtpefmzbLfX0ujCz4e9+VsAtEFD1sKjuQ5cglV2ZC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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