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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13b9155f0e4dd6d0a7036767f7544ee7f55222d80cc6f62de11059b195f7490' 
  AND token = 'uZU9zW9dnrEofCAURQsElIL77gmZP4yRVuvSxJEcZ8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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