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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84be4e225d43f0690b15c5af1632e7344b651d53dbb1ec5a6e131829881424ca' 
  AND token = '0pZxYOc5c6OM/KactPShW015/xTGj3+99XEqgBgJ/1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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