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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baac1c87867dda63007768f6a0f70fd077263b3f02b8c3a63a714db8e1537d3c' 
  AND token = 'YhFw+bNpL3P9ldl8HpO6r/tulFBsT0GwGcIpb9sFNB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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