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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae95e06137e100f3e5fce44fd42063db78a3847f84a869ea18735fae93623aae' 
  AND token = 'a/4dFxNKQC0/6JjUIdu6XEnqpChYCDM4BzfLeSFxaWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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