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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1726cf2b28560d63b1dbeea3ea23b17ea114f22e1bfffa6cf5912cd49832ced' 
  AND token = 'gWsuw082fxfMj5sKwwouqByCk9ToklkW55lL4RTspA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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