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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c9a5df75c5af7e632175261d645c89b276e78ef46fee1b55531fffbce24491' 
  AND token = 'WBtbqjQ27klQmVic1lBnHsifDqzHIhOSDcoLB/L3GgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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