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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a93b5b11c72a0a5484a0a6490473e1646df7727842bd0fe9526fc26bdaa0d39' 
  AND token = 'A1ceXx0qtktG4ZtUPYRI3oHkX657olQYI65aWaFOVlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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