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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841abe11f3b5a7cea31fee0585de7e84c68749dcf739b7a7f7fb57dd6dda2ea1' 
  AND token = 'cYh9q96Y4Hng8D+VsY7+DXN4regw8GJDkXBln5jAoq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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