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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4066de320d86951b888e465eb6ec883fa6d4a02e2f2428b2b693c6d05796ee' 
  AND token = 'B7fZ/zKeCJDyoIpY5rdKIE8LG30vXa8UYZzz1b43OXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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