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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7205e98f95252cbfd588381030e390a8a8029c14b7458f71d29ce3a6cc7db2b3' 
  AND token = '2XsjP3EQytS3fYX5IL4HJhTksILtg5Vs45+Jxd7JLOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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