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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6941f8a905ae70704ccb2b6e532b9c18c861de764bfab6eedba76127cab052e' 
  AND token = 'lYj2at5bPNA9XQM6SKGij3vOYWxDdRN46ZtrT/Cy3YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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