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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00fdef1eaae44ebfba3f995fbbae0a3525fcca88e674eebf416dfb1e6f1d426' 
  AND token = '688AB/mKYzLUV93fLYRa+qdYGiWWp74R/ec6d3wjaZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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