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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069e4ad2d128d2cc9f4ace58b4b83a8ae8483e4bf05ce5bfe81d089e4357c147' 
  AND token = 'uXUIPirGVF8GEKWlD+u5dGJQL5oKu2JoHHDhmHRG7OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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