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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6c45b99313c14b7d0cb38593c463f4c8b716b67a999964a38ed3bb7f8cbc79' 
  AND token = 'Jbm0Kqr7LUcKTG04RSBiplskrXtNvUCOzFdXuBegnEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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