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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9593da5ed433ce0efcc75a9c08c40347cddce3fba07a99fb2e8b961f82468d' 
  AND token = '8QBPF3zCN+U2Z8+kMD4NLoyWsqM5JbN5TlNgTKoib8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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