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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ece23649492fe34a88eb040779c8201b0c1e597870e8281dfb3d9aaf6ed0c8' 
  AND token = 'jt+zQyAIzKLyP7FchGOrtEdUUKRES6kqwIlUcvq1c0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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