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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ff9269713686df387a383a6401a7e01ac7ee14df22b2e04ce006abc665df88' 
  AND token = 'Z7K8WpWt0QaC4O6ItmZAgCV06HNI1vBnIOrWRopI6hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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