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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34ec658d2dec7e86023cdaf42b0ec4a8be31bfa9d1599ab97635ab7131b8184' 
  AND token = 'Xx9X2XEDH28OdmUNf9ucdNGAtG0cPtm5kRUXeEN9I5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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