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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac02f3725441b6363a6582daaba522e138c720988759d20d1cc4fb2708fd7b47' 
  AND token = 'DBpV0zksA04WmC8RJvTxhpe9Q4QfJc1yC0Jl3zFtdME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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