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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0a6b4e745fa6412785200d167f3a28ebaa00b9b3385ec8ed92fa28add2fe35' 
  AND token = 'qIR3D8GvpI4OFBxbU3G78rBMdP0ta8Au5fXeufLXpw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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