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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f11347e5ed441c835808805ac13471ddc5bbf108c16d451a1da972b01738a77' 
  AND token = '1LjA2cFjRDdYP+kVDM4EMBw8JPJMH4LmUF6Y7rcnnRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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