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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc260601ed981de108a09efc6988ceb0f25f709a1c1f574afa42fcff324b595' 
  AND token = 'woF90SIOWuhkJnZw+uDk4BvTKFdqF31J3ppflNgR7ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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