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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49b271bb31140f1a81645e5d4e7c5b7e1c3d62a3ac4226da3f10bc8fea0bb94' 
  AND token = 'CK5H9k0cg6dWSgbyN9dwoj8WLrNxWvcZwJzcp+yaiBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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