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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e5178d992fecfdccb45188a387770844814c19b05e2392c96c92ed2323210f' 
  AND token = 'uZ5yAhDIuerssDxlv+UBx//qzxY/sYLma88/+Jqxr5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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