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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b589091679a4915a8a62d7d5e95ff4bff36a61fbfba27e879e8fd18b0ff3b1ef' 
  AND token = '07ZqXzhJBUgGEsaA3k4hZATgS9sR9vQTg24b7sbpERQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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