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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a83fc68e6d8f0deebee6e147d581a14d564029554da95468a517a2b861fd6e9' 
  AND token = '4MeTNQzGEdDtvlkhM6D9dAaUYVloP/C2EVAF5MmY6Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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