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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cea4626aeac64e47008d334b23fd88fda217ea2cb7ba46fb8da6da59ea2eb4' 
  AND token = 'rRRwSowBpVpT3KQsbM3NutIcVKmlEwiuHy7pMDfvmKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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