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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd1009ef8f26be637aa480e5f2a7c59aded9715a781da431d4b11b31814f19c' 
  AND token = '4cFyuZxX6PQYOVYBvDTBBLSV0EJhmN3g6aiR1VLYcys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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