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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e95fbab0cb25029a0cb175cc6b57e714c510059f378dfd637364ab24a29dab' 
  AND token = '4AVU7PtVhee053kpPGYxUv6uC5ibRoqwfC82akvWMTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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