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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba4edf0badf92318aca70644589082f19c60209bab6a0bd16433e43c422ab9b' 
  AND token = 'q7BECIXtzDq/gH8MCWyuuE9xeilTh/FaYZXcZ8KhtEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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