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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d40c6bab3f9400a64f8d6fa6217868d08928230ddef18fa30091ce7e468619' 
  AND token = 'p/A8Wx5OlBGJSc2FcLjLKuVRZu9+AJNa7b4xeCQkABE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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