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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba191ee7ad66fee713fe2b538bfd0ed60e74520d5e4969df8f3dc77dc8cfbaf7' 
  AND token = 'EayRyO+WSDEJH6bgscGSaLnRRUWGXirrsqKyE7TW8QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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