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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ccd94cbe8f4d1816620f856a6c858f2c8aade864f1c9bcbca1af6a0e9dcd64' 
  AND token = '3nkkotloCxnjq2b5vKNmV6D7fAItkXzwzdt9Rzx3gss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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