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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc68a61eee306f30e10afc53074748bb339d6393a83bf49293929d6a48901dbf' 
  AND token = '8qsxoAGGmFcU6zhDDWligSgoyOP2BeoFB8GHlXcB+Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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