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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022d17e36fe7e2374f97934270e7bdd1473ae90780669b9eac2ad88acbf61dc3' 
  AND token = 'dpFHSc0zD186biXDFpHji7HW5Vm/PlqMQ5+KvuXY/l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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