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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f13ac1a3f5ed753299441a426618c00a8769322f608cc7a3d3301fef6dd3656' 
  AND token = 'yZSh5n5B9cRVBLp4DFV/FmzGT0nLkMXxFNZIhDVTlnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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