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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79abc5c108674f2b105c851e772495af940938260b0b0a810d87c65fad9e2288' 
  AND token = '8+5mSYs/H8ugQXJiJN7oV9OobmDz2iEF/457YbeHWwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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