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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1560b6be2b2c09699898e2022a0dbb1e0e373e5dc0f6b0ac21a4c3bcfd13d963' 
  AND token = 'C1GbUSvaTgPQy4B3uvCyp7Nh2+7JZkG6Du7ZH/JTQ5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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