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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c579024f540c1d0370b6c79c346dd4910aaca6d75ca7884031d29338b1e6424d' 
  AND token = 'L5yrzbIEW5SGjBBL9Ue0RdQ9nT5N+0fzEzOd64o+vg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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