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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829622a4bbc6c1dd22407ba78bd9c65fdb94f3178b084f5a48f33a125c0bc8f7' 
  AND token = 'T1tELbpfXuvphSr9R8lZVXgERdoXLvazgZpdospT+cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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