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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9a8cf19495226f3b901704257072f593414767dd06bafa4155e8a6a8f5d062' 
  AND token = 'Sl3TOyw1IiPsQCQHZHZ3MfFLGnM7zjrNt3nGR8ZWekE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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