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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecd396b4cb2e3b7b309a6ce464e550baa4a7132347e1e9c8c30dafcd7889147' 
  AND token = 'HiN5GzYZviiV2GCuxo7cqpB84SNvLDMpn6iX+TYWL50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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