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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522930088a76fd35993f3d93922d3eee23162c3faca8c149f004b5c126630b66' 
  AND token = 'olr8z7vAU5obEovCtdNUH3suPMMvh2SyGvuKxLPs8fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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