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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea42ae185bb30789cb13014686b2eb54c2f466ae849e438444c8e29d14a1e2f' 
  AND token = 'fAIfcnxino/N0Sh52yp/6QB+gYWnmUQXKptJzRTnV1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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