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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bfd93a6d100d89e73d0295ef4014eae329e14dc29cb0d168f1d8a137bb5e4d' 
  AND token = 'zU1QXwE8pv0lkuvJkp2RYWpuBfKhl4rhKWmB/ssWtEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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