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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfef7e8b873fff0b0aa0fc3a3a7a3b23651c6fcdb63e874a06182d7678fc86e7' 
  AND token = 'XjPh9I5Zs/E24rMGjmKvlYNNSRqsfgqn40yX0ZaXrIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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