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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b23602ad1eeeb24ca6c0ebd0b1bdd307d0ec6bf8f208160c110cff28bf953f6' 
  AND token = 'GZFHxJUz3xxNCLmLjX5ZFMECEwpdBxF1m0OnFCahXyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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