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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fea4a3d4c5e6aa45c20bdfa52c2e5c8fe6a554d01f43c5a62e5bdd8e053172' 
  AND token = 'idZJouZJjxGJ4hS/lENAj/mRHj8ct9qh6R5CQ4ReV0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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